Sintering of metalliferous materials



Nov. 29, 1932. e. F. WEATON ET AL 1,889,055

SINTERING 0F METALLIFEROUS MATERIALS Filed Feb. 25, 1932 2 Shets-Sheet 1Nov. 29, 1932-. s. F. WEATON ET AL SINTERING OF METALLIFEROUS MATERIALS2' Sheets-Sheet 2 Filed Feb. 25, 19:52

UUUdIH Patented Nov. 29, 1932 UNITED STATES PATENT OFFICE- GEORGE IE.WEATON AND HERAN D K. NAJ'ARIAN, OF BEAVER, PENNSYLVANIA, ASSIGN- ORS TOST. JOSEPH LEAD COMPANY, OF NEW YORK, N. Y., A CORPORATION OENEW YORKSINTEBING OF METALLIFEROUS MATERIALS Application filed February 25,1932. Serial No. 595,150.

' The present invention is directed to a method and apparatus forremoving accretions or deposits from the grate bars of sinteringmachines, particularly those of the traveling 5 grate type such as theDwight and Lloyd sintering machine.

One object of the invention is to provide a method and means wherebyaccretions or depositsmay be substantially completely removed from thegrate bars whereby obstruction of the draft and consequent irregularworking of the sintering operation is avoided. Another object,particularly when zinc ores are to be sintered, is to remove suchdeposits 15 ascontain segregated contamlnants and thereby to preventthem from're-entering the sintered product.

In brief the invention comprises a method and means whereby the gratebars, after the in the usual manner, are subjected to repeated blowswhereby the adhering matter is dislodged.

The invention will be more particularly described by way of example withreference to the accompanying drawings wherein:

V Fig. 1 is an elevation showing a grate bar jarring mechanism,constructed in accordance with the invention,'in operative relation tothe grate bars of a sintering machine of the usual type;

Fig. 2 is an elevation in partial section showing the principle ofoperation of the invention;

Fig. 3 is a plan view of the grate bar mechanism illustrated in Figs. 1and 2; and

Fig. 4 is a view in partial section of a modified form of the invention.

In the drawings, 1 are grate bars, carried on a plurality of pallets(not shown) in the usual manner in an endless belt around rotatablewheels 2 and 3. The grate bars may be of any desired shape andare'advantageously provided with small ribs to maintain a uni? formspacing between the bars.

"The grate bar cleaning mechanism comprises the following elements: avstriking,. b'ar 4, substantially as long as the width of the grate barsand attached to one end of lever arms 5, the other ends of which arerigidly sintered product has been removed therefrom attached to a pivotshaft 6; a counterweight 7 attached to one end of lever arms 8, theother ends of which are likewise rigidly attached to said pivot shaft 6and positioned oppositely to said striking bar 4; a cam button 9 rigidlyfastened to one end of a lever arm 10, the other end of which is alsorigidly fastened to pivot shaft 6 and positioned at a small angledownwardly from counterweight lever arms 8; bearings '11 and 12,

carried on rigid frameworkof the sintering machine, in whichthe two endsof pivot shaft 6 are rotatably mounted; a cam 13, rigidly attached to ashaft 14, which is in turn rotatably mounted in bearings 15 and 16; anda motor 17, geared to one end of shaft 14.

In the operation of the sintering machine,

a mixture ofore with sufiicient sulfur for sinter fuel, or of ore andcarbonaceous material is fed on top of the grates 1, forming a bed 18 ofuniform thickness, and ignited by Suction is applied to the underside ofthe grates under the bed of material, causing a stream of air and flameto pass through:

' portion of the partially fused volatilized ma-v terial, however, isfound attached to the surfaces ofthe grate bars and also lodged in theopenings between the grate bars, causing the openings to be partially orwholly obstructed. Portions of these deposits subsequently break offasithe grate bars discharge their sintered ore load by gravity and thusre-introduce into the sintered ore the segregated contaminants.

The operation of is as follows: a

The motor 17 rotates shaft 14 and cam 13 be cleaning mechanism surfaceof the in the direction of arrow a. The curved surface of the cam liftsbutton 9 to its maximum height shown in solid lines. in which positioncounterweight 7 and striking bar 4 take the position also shown by fulllines.. The weights of the counterweight 7 and striking bar 4 are soproportioned as to make the turning moment of counterweight 7 about theaxis of pivot shaft 6 much in excess of the turning moment of strikingbar 4. When the, cam rotates further and the cam point passes the edgeof the cam button 9, the counterweight falls and causes the bar 4 tostrike a blow against the under surface of the grate bars, at which timethe striking bar 4, counterweight 7, andcam button 9 take the positionshown in dotted lines. The surface of cam coming in contact with the cambutton is so designed as to commence lifting the button shortly afterthe striking bar strikes the grates. The repeated intermittent blowsofthe striking bar 4 against the grate bars as the cam rotates, causesthe partially fused and deposited contaminants attached to the surfaceof the grate bars to break into pieces and be detached from the gratesand fall into a receiving hopper, not shown. Furthermore, the gratebars, which are usually held fast by the particles of contaminantslodged in the openings between grate bars, are jarred loose by theblowsof the striking hammer, this relative move- -ment between grate barshelping-the material lodged in between grate bars to be crumbled anddislodged therefrom.

The efiect of the removal of these deposits of contaminants from thegrate is to improve the quality of the ultimate product and in creasethe capacity of the sintering machine due to the clearing of the airpassages, which promotes the combustion necessary for the sintering ofthe mass and the recovery of the contaminating substances.

The modification'shown in Fig. 4 is p,ar-'

ticularly adapted to effect the removal of accretions or deposits fromgrate bars of the type positioned parallel to the direction of travel ofthe pallets of the sintering machine.

As shown, the mechanism is similar to the mechanism of Figs. 1 to 3, asis indicated by the corresponding primed reference .numerals. In thisembodiment of the invention, striking bar 4' is provided withprojections 4a adapted "to strike alternate grate bars of the assemblywhen the grate bars are in their inverted position. This actioneffectively cleans the accretions and deposits from the grate bars.

It will thus be seen that the invention broadly comprises a method ofcleaning the grate bars of sintering machines which consists insubjecting said grate bars to intermittent impacts;;and a mechanism foreffecting the cleaning of grate bars of sintering 5 machines comprisingstriking means and means for causing said striking means to impingeagainst said grate bars.

This application is a continuation-in-part of our application Serial No.539,912, filed May 25, 1931.

We claim:

1. Apparatus for cleaning thegrate bars of sintering machines comprisinga striking member, and means for causing said striking memberperiodically to impinge against said grate bars.

2. Apparatus for cleaning the grate bars of sintering machinescomprising a striking member connected to a pivot member, and means foractuating said striking member on said pivot member so as periodicallyto impinge against said grate bars.

3. Apparatus for cleaning the grate bars of sintering machinescomprising a striking member connected to a pivot member and positionedparallel and subjacent to the grate bars of the sintering machine, arotatable cam member in operative relation to said striking member andpositioned to cause said striking member to impinge against said gratebars upon rotation of said cam member, and means to effect the rotationof said cam member. 1

4. Apparatus for cleaning the grate bars of sintering machines havinglongitudinally positioned grate bars comprising a striking memberadapted to engage alternate grate bars and means for causing saidstriking member periodically to impinge against said alternate gratebars.

5. Apparatus for cleaning the grate bars of sintering machinescomprising a striking member connected to a pivot member, said strikingmember being positioned subjacent and at right angles to the grate barsof the sintering machine, a rotatable cam member in operative relationto said striking member and positioned to cause said striking member toimpinge against said grate bars upon rotation of said cam member, andmeans f0 effecting the rotation of said cam member. v6.. Apparatus forcleaning the grate bars of-s'intering machines comprising a strikingmember connected to a pivot member, said striking member being ositionedsubjacent and at right angles to t e grate bars of the sintering machineand provided which projections adapted to engage alternate grate bars, arotatable cam member in operative relation to said striking member andpositioned to cause said striking member to impinge against saidalternate grate bars upon rotation of said cam member, and means foreffecting the rotation of said cam member.

In testimony whereof, we afix our signatures.

GEORGE F. WEATON. HERAND K. NAJARIAN.

